2020 source guide · Physics

NEET 2020 Physics Modern Physics Questions

Use this page to connect the official 2020 paper with current Physics practice. NeetVellum does not claim a chapter appeared in that paper until the official question and final key have been mapped.

Practice 318 verified questions →Check official NTA archive ↗

What to master

photoelectric effect, atomic models, spectra, nuclei and radioactivity.

Original practice preview

These are current-syllabus NeetVellum questions, shown separately from historical-paper provenance.

Example 1 · difficulty 3/5

In the Davisson and Germer experiment, electrons accelerated from rest through 54 V are diffracted by a nickel crystal, giving a strong maximum at a scattering angle of 50°. The de Broglie wavelength of these electrons, computed from the accelerating potential, is closest to:

A. 1.67 Å
B. 0.54 Å
C. 12.27 Å
D. 7.35 Å

Example 2 · difficulty 4/5

When a metal surface is illuminated with light of wavelength 250 nm, the stopping potential is 2.0 V. When the wavelength is changed to 200 nm, the stopping potential becomes closest to (hc = 1240 eV nm):

A. 4.0 V
B. 2.96 V
C. 3.24 V
D. 6.2 V

Example 3 · difficulty 2/5

A laser beam of power 10 mW falls normally on a perfectly reflecting surface. The force exerted on the surface is about (c = 3 × 10⁸ m s⁻¹):

A. 3.3 × 10⁻¹¹ N
B. 6.7 × 10⁻¹¹ N
C. 3.3 × 10⁻⁸ N
D. 6.7 × 10⁻⁸ N

The evidence-first practice loop

1. Verify provenanceOfficial paper and final key before accepting a PYQ label.
2. Attempt closed-bookExpose the concept or execution gap before rereading.
3. Repair and returnClassify the miss and re-practice after a delay.

Canonical chapter practice

Dual Nature of Radiation and Matter →Atoms →Nuclei →

Frequently asked questions

Are these official NEET 2020 Physics Modern Physics PYQs?

No. The previews are original NeetVellum practice questions. A historical item receives a PYQ label only after its official paper and authoritative final answer key are attached. Use the official archive for the source paper.

How should I use the NEET 2020 paper?

Solve the official paper under its original timing, verify against the final key, classify every miss, and then use the linked current-syllabus practice bank to repair the exposed concept.